function copyToClipboard() 
{
	var txt = $(".invite_code_desc").text();
    if (window.clipboardData) {

        window.clipboardData.clearData();

        window.clipboardData.setData("Text", txt);

        alert("复制成功.");

    } else if (navigator.userAgent.indexOf("Opera") != -1) {

        window.location = txt;

    } else if (window.netscape) {

        try {

            netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");

        } catch (e) {

            alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将'signed.applets.codebase_principal_support'设置为'true'");

        }

        var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);

        if (!clip) return;

        var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);

        if (!trans) return;

        trans.addDataFlavor('text/unicode');

        var str = new Object();

        var len = new Object();

        var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);

        var copytext = txt;

        str.data = copytext;

        trans.setTransferData("text/unicode", str, copytext.length * 2);

        var clipid = Components.interfaces.nsIClipboard;

        if (!clip) return false;

        clip.setData(trans, null, clipid.kGlobalClipboard);

        alert("复制成功.");

    } 
} 
